High-temperature material

Abstract

A high temperature material which consists of a chromium oxide forming iron alloy including: a) 12 to 28 wt % chromium, b) 0.01 to 0.4 wt % La, c) 0.2 to 1.0 wt % Mn, d) 0.05 to 0.4 wt % Ti, e) less than 0.2 wt % Si, f) less than 0.2 wt % Al, wherein, at temperatures of 700° C. to 950° C., the high temperature material is capable of forming a Mn Cr 2 O 4 spinel phase. At a temperature of 700° C. to 950° on Mn, Cr 2 O 4 the spinel phase formed protects a body, such as spark plug electrodes and other electrodes.

1. A high temperature material comprising a chromium oxide forming an iron-based alloy containing:
 a) 12 to 28 wt % chromium,  
 b) 0.01 to 0.4 wt % La,  
 c) 0.2 to 1.0 wt % Mn,  
 d) 0.05 to 0.4 wt % Ti,  
 e) less than 0.2 wt % Si,  
 f) less than 0.2 wt % Al,  
 with the property that at temperatures of 700° C. to 950° C. said high temperature material is capable of forming at its surface a Mn Cr 2 O 4  spinel phase.  
 
     
     
       2. A high temperature material according to  claim 1 , wherein said chromium oxide forming iron-based alloy additionally includes 0.1 to 0.4 wt % of an element or mixture of the group of elements consisting of Y and Ce. 
     
     
       3. A high temperature material according to  claim 2 , wherein said chromium oxide forming iron alloy includes additionally 0.1 to 0.4 wt % of an element or mixture of the group of elements consisting of Hf, Sr, Ca, Zr. 
     
     
       4. A high temperature material according to  claim 1 , wherein manganese is included in the chromium oxide forming iron alloy. 
     
     
       5. A high temperature material according to  claim 1 , wherein said chromium oxide forming iron alloy contains additionally up to 1 wt % of at least one element of the group consisting of C, N, S, B and P. 
     
     
       6. A high temperature material according to  claim 1 , wherein said chromium oxide forming iron alloys contains additionally up to 1 wt % of at least one of the elements vanadium and copper. 
     
     
       7. A high temperature material according to  claim 1 , wherein said chromium oxide forming iron alloys contains up to 1 wt % of at least one element of the group of Mo, W, Nb, Ta, and Re. 
     
     
       8. A bipolar plate consisting of a high temperature material comprising a chromium oxide forming iron alloy including:
 a) 12 to 28 wt % chromium,  
 b) 0.01 to 0.4 wt % La,  
 c) 0.2 to 1.0 wt % Mn,  
 d) 0.05 to 0.4 wt % Ti,  
 e) less than 0.2 wt % Si,  
 f) less than 0.2 wt % Al,  
 wherein, at temperatures of 700° C. to 950° C., said high temperature material is capable of forming a MnCr 2 O 4  spinel phase.  
 
     
     
       9. A spark plug including electrodes consisting of a high temperature material comprising a chromium oxide forming iron alloy including:
 a) 12 to 28 wt % chromium,  
 b) 0.01 to 0.4 wt % La,  
 c) 0.2 to 1.0 wt % Mn,  
 d) 0.05 to 0.4 wt % Ti,  
 e) less than 0.2 wt % Si,  
 f) less than 0.2 wt % Al,  
 wherein, at temperatures of 700° C. to 950° C., said high temperature material is capable of forming a MnCr 2 O 4  spinel phase.  
 
     
     
       10. An electrode consisting a high temperature material comprising a chromium oxide forming iron alloy including:
 a) 12 to 28 wt % chromium,  
 b) 0.01 to 0.4 wt % La,  
 c) 0.2 to 1.0 wt % Mn,  
 d) 0.05 to 0.4 wt % Ti,  
 e) less than 0.2 wt % Si,  
 f) less than 0.2 wt % Al,  
 wherein, at temperatures of 700° C. to 950° C. said high temperature material is capable of forming a Mn Cr 2 O 4  spinel phase.